<template>
    <div>
         <!-- 面包屑 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
             <el-alert
                title="消息提示的文案" type="info" center show-icon :closable="false">
            </el-alert>
            <!-- 步骤条区域 -->
            <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                         <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange">
                        </el-cascader>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                      <!-- 渲染表单的Item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                    <!-- 复选框组 -->
                    <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
                    </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                    <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                     <!-- action表示图片要上传的地址 -->
                     <!--  :on-preview为预览功能 -->
                     <!-- :on-remove="handleRemove"点击关闭时触发 -->
                     <!-- list-type图片的呈现方式 -->
                    <el-upload
                :action="uploadURL"
                :on-preview="handlePreview"
                :on-remove="handleRemove"
                list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                <el-button size="small" type="primary">点击上传</el-button>
                </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                  <!-- 富文本编辑器组件 -->
                  <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                  <!-- 添加商品的按钮 -->
                  <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="50%">
        <img :src="previewPath" alt="" class="previewImg">
      </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default {
    data(){
        return{
             activeIndex: '0',
            //  添加商品表单的数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                  // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                // 商品的详情描述
                goods_introduce:'',
                 attrs: []
            },
            // 表单的验证规则
            addFormRules:{
                goods_name: [
                { required: true, message: '请输入商品名称', trigger: 'blur' }
                ],
                goods_price: [
                { required: true, message: '请输入商品价格', trigger: 'blur' }
                ],
                goods_weight: [
                { required: true, message: '请输入商品重量', trigger: 'blur' }
                ],
                goods_number: [
                { required: true, message: '请输入商品数量', trigger: 'blur' }
                ],
                goods_cat: [
                { required: true, message: '请选择商品分类', trigger: 'blur' }
                ]
            },
            // 商品分类列表
            catelist: [],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manyTableData:[],
             // 静态属性列表数据
            onlyTableData: [],
            // 上传图片的url地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
             // 图片上传组件的headers请求头对象
            headerObj: {
              Authorization: window.sessionStorage.getItem('token')
            },
            // 保存预览事件的
            previewPath: '',
            previewVisible: false
        }
    },
    created() {
        this.getCateList()
    },
    methods:{
         // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }

      this.catelist = res.data
      // console.log(this.catelist)
    },
     // 级联选择器选中项变化，会触发这个函数
    handleChange() {
      // console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
     beforeTabLeave(activeName, oldActiveName) {
    //   console.log('即将离开的标签页名字是：' + oldActiveName)
    //   console.log('即将进入的标签页名字是：' + activeName)
    //   return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    async tabClicked(){
        // console.log(this.activeIndex);
         if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }

        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      }else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败！')
        }

        // console.log(res.data)
        this.onlyTableData = res.data
      }
    },
     // 处理图片预览效果
    handlePreview(file) {
      // console.log(file);
      this.previewPath=file.response.data.url
      this.previewVisible=true
    },
    // 处理移除图片的操作
    handleRemove(file){
    // console.log(file)
     // 1. 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2. 从 pics 数组中，找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3. 调用数组的 splice 方法，把图片信息对象，从 pics 数组中移除
      this.addForm.pics.splice(i, 1)
      // console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handleSuccess(response) {
      // console.log(response)
      // 1. 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2. 将图片信息对象，push 到pics数组中
      this.addForm.pics.push(picInfo)
      // console.log(this.addForm)
    },
    // 添加商品
   add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项！')
        }
        // 执行添加的业务逻辑
        // lodash   cloneDeep(obj)
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)

        // 发起请求添加商品
        // 商品的名称，必须是唯一的
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) {
          return this.$message.error('添加商品失败！')
        }

        this.$message.success('添加商品成功！')
        this.$router.push('/goods')
      })
    }
    },
     computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>